Btukfyl

I have the following R code to generate a tikzdevice plot:

tikz(file = "plot_CIs.tex", width = 5, height = 5)

par(cex = 0.8)

ggplot(confidence_interval, aes(x = Statistic, y = Values, group = 1)) +

  geom_errorbar(width = 0.1, aes(ymin = Lower_Bound, ymax = Upper_Bound)) +

  geom_point(shape = 21, size = 3, fill = "white") +

  labs(title = title, subtitle = subtitle) +

  theme(plot.title = element_text(hjust = 0.5)) +

  theme(plot.subtitle = element_text(hjust = 0.5))

In latex I then use the following:

documentclass{article}

%The package tikz is available in pgf

usepackage{tikz}

usepackage[justification=centering]{caption}



begin{document}



begin{figure}

  %Do not try to scale figure in .tex or you loose font size consistency

      centering

  %The code to input the plot is extremely simple

  input{../plot_CIs.tex}

  %Captions and Labels can be used since this is a figure environment

  caption{Sample output from tikzDevice}

  label{plot:test}

end{figure}

end{document}

Which results in this image (in a latex pdf):

Why is the caption: "Figure 1: Sample output..." not centered underneath the figure plot area?